Flores

Photo of this volcano
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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 39.462°N
  • 31.216°W

  • 914 m
    2998 ft

  • 382001
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Flores.

The Global Volcanism Program has no Weekly Reports available for Flores.

The Global Volcanism Program has no Bulletin Reports available for Flores.

Flores Island and Corvo Island to its north are located far west of the rest of the Azores islands and are the only two Azorean volcanoes lying west of the Mid-Atlantic Ridge. Growth of an initially submarine volcano included Pleistocene explosive activity associated with formation of small calderas. The 10 x 15 km island of Flores is dotted by numerous pyroclastic cones and craters. Following a long period of quiescence beginning about 200,000 years ago, several young phreatomagmatic craters and associated lava flows were erupted during the Holocene, including two about 3000 years ago. The Caldeira Funda de Lajes tuff ring formed about 3150 years ago, accompanied by a lava flow that traveled to the SE, reaching the coast at Lajes. The Caldeira Comprida tuff ring in Caldeira Seca, west-central Flores, erupted about 2900 years ago. It produced a lava flow that traveled NW-ward and reached the coast at Faja Grande.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
0950 BCE ± 100 years Unknown Confirmed   Radiocarbon (uncorrected) Caldeira Comprida
1200 BCE ± 100 years Unknown Confirmed   Radiocarbon (uncorrected) Caldeira Funda de Lajes

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.



Cones
Feature Name Feature Type Elevation Latitude Longitude
Camprida, Caldeira Tuff ring 39° 26' 28" N 31° 13' 1" W
Funda de Lajes, Caldeira Tuff ring 39° 24' 22" N 31° 13' 1" W
Funda, Lagoa Stratovolcano 39° 23' 0" N 31° 11' 0" W
Se, Pico da Stratovolcano 722 m 39° 24' 0" N 31° 10' 0" W


Craters
Feature Name Feature Type Elevation Latitude Longitude
Branca, Caldeira Maar
Masteiro, Caldeira Crater
Rasa, Caldeira Crater
Seca, Caldeira Crater
The northern half of the 10 x 15 km wide island of Flores, which lies west of the Mid-Atlantic Ridge, appears at the margin of this NASA Space Shuttle image. Ponta Delgada lies at the northern tip of the island at the lower left. Several craters seen to the left of the cloud banks at the lower right were formed during eruptions about 2900 years ago that also produced a lava flow that forms the Faja Grande Peninsula below the craters.

NASA Space Shuttle image ISS007-E-11252, 2003 (http://eol.jsc.nasa.gov/).
Lakes occupy Caldiera Funda de Lajes (left) and Caldiera Rasa (right) on SW Flores Island in this view from the east. The Caldeira Funda de Lajes tuff ring formed about 3150 years ago, accompanied by a lava flow that traveled to the SE, reaching the SE coast of Flores at Lajes. The 10 x 15 km island of Flores is dotted by numerous pyroclastic cones and craters.

Photo by Björn Ehrlich, 2007 (Wikipedia).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Azevedo J M M, Ferreira M R P, 2006. The volcanotectonic evolution of Flores Island, Azores (Portugal). J Volc Geotherm Res, 156: 90-102.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Mitchell-Thome R C, 1976. Geology of the Middle Atlantic Islands. Berlin: Gebruder Borntraeger, 382 p.

Morisseau M, Traineau H, 1985. Mise en evidence d'une activite hydromagmatique Holocene sur l'Ile de Flores (Acores). CR Acad Sci Paris, 301: 1309-1314.

Zbyszewski G, Candido de Medeiros A, Veiga Ferreira O da, Torre de Assuncao C, 1968. Geologic map of Ihla das Flores (Azores). Servicos Geologicos Portugal, 1:25,000 scale map with 31 p text (in Portuguese).

Volcano Types

Stratovolcano(es)
Caldera(s)
Pyroclastic cone(s)

Tectonic Setting

Intraplate
Continental crust (> 25 km)

Rock Types

Major
Basalt / Picro-Basalt
Trachybasalt / Tephrite Basanite
Trachyandesite / Basaltic trachy-andesite
Trachyte / Trachyandesite
Minor
Phono-tephrite / Tephri-phonolite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
1,054
4,560
5,825
5,865

Affiliated Databases

Large Eruptions of Flores Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.